Typewriting-machine



G. W. CAMPBELL.

TYPEWRITING MACHINE.

APPLICATION FILED JAN-30. 1920.

1,370,282. Patented Mar. 1, 1921.

2 SHQETS-SHEET I.

FIGJ.

G. W. CAMPBELL.

TYPEWRITING MACHINE.

. APPLICATION FILED mmao, 1920.

1,370,282. Patented Mar. 1, 1921.

2 SHEETS -SHEET 2- INVENTOR= wa M ATT N EY.

UNITED STATES PATENT OFFICE.

GEORGE W. CAMPBELL, OF HARTFORD, CONNECTICUT, ASSIGNOR '10 UNDEBWOOD mnwmnn COMPANY, OF NEW YORK, N. Y., A CORPORATION 01 DELAWARE.

' TYPEWRITING-HAGHINE.

Specification of Letters Patent.

Patented Mar. 1, 1921.

To all whom it may concern:

Be it known that I, GEORGE W. CAMrBnnL, a citizen of the United States, residing 1n Hartford, in the county of Hartford and State of Connecticut, have invented certain new and useful Improvements in Typewriting-Machines, of which the following 1s a specification.

This invention relates to typewrltmg machines, and is particularly adapted for use in connection with machines of the portable t e.

ilo construct a typewriter of the abovedescribed character, and distribute the material in such manner as to produce a machine of the desired minimum size and weight, it is necessary to mount the various parts of the mechanism in a supporting frame which must be of a form best suited to the purpose, considered as a structural element, and to locate the fastening devloes therein in positions which must be determined primarily from the standpoint of utility and efficiency. This would ordinarily result in a product which would be displeasing in appearance and not adapted to appeal to the esthetic taste of the prospective purchaser and either unduly heavy, 1n order to secure the desired strength, or else unduly weak, in order to secure the desired 1i htness.

the aid of the invention, herein illustrated and described, it is made practicable to construct a strong machine which may be of the requisite minimum weight and size, and yet present a neat and attractive appearance. This is accomplished by mounting the parts of the mechanism in a skeleton frame member of steel or other appropriate structural material, which ma be of the form best adapted to receive t e necessary -screws, bolts and other mounting elements,

and by providing a light, stiff auxiliary base, which may be constructed of aluminum or other appropriate material, to surround and conceal all, or substantially all, of the skeleton frame member and parts of the mechanism mounted therein. The auxiliary base may be secured to the skeleton frame by fastening devices attached to its inner surface only, so that it may have an unbroken outer surface, and may be polished or otherwise finished, so asto present a neat, attractive appearance adapted to appeal to the trade. The skeleton frame member and the auxiliary base firmly fastened thereto combine to make a double frame of great strength and lightness.

Other features and advantages will hereinafter appear.

In the accompanying drawings,

Figure l is a perspective view, illustrating a portion of a typpwriter, herein disclosed as one of the nderwood portable type, with my invention applied thereto, the auxiliary base being indicated in broken lines.

Fig. 2 is a perspective view of the aux;- iliary base separate from the machine.

Fig. 3 is a section throu h the machine and the auxiliary base 100 ing from the rear, parts of the machine being omitted for the sake of clearness.

Fig. 4 is a perspective view of a portion of the auxiliary base, Fi 2 and I being viewed from different ang es.

In Fig. 1 is disclosed a typewriter of the portable type such as that manufactured and sold by the Underwood Typewriter Company, but my invention is in no manner limited in its application to a machine of that particular make. As herein disclosed, the typewriter comprises the usual character keys 10, platen 11, type-bar segment 12 and other parts which need not be specifically mentioned. To serve as a. mounting for the various parts of the mechanism, there is provided a built-up sheet-metal skeleton frame 13 resting on rubber cushions or other suitable supportin elements 14. 1

' 11 order that the skeleton frame 13 may have its material so distributed as to form the most appropriate and satisfactory mounting member for the various parts of the typewriter mechanism, without being of a weight which might be prohibitive in a machine of this character, parts of this frame member 13 may have to be cut away, as indicated, leaving openings through which various more or less unsightl mechanical parts of the machine would be exposed for observation. This skeleton frame member 13 must also ncessarily serve as a foundation or support, to which various screws, bolts and other fastening devices must be secured. Such devices would also be more or less objectionable from the standpoint of appearance.

For the purpose of overcoming the abovementioned objections as to appearance and still permit the skeleton frame memberto be desi ned entirel with a view to maximum mec anlcal efliclency and utility, I prov1de an auxiliary outer base 15, whlch may be constructed of aluminum or other light material, to closely surroundand inclose the skeleton frame member, so as to conceal the whole or greater portion thereof as well as of the 111131 htly fastening devices and parts of the mec anism mounted therein. This auxiliary base may be so designed as to be of a pleasing and attractive appearance. Its surfaces may be gracefully curved or rounded, and its lmes may be such as to harmonize with the general hues of the machine. It may also be of such form, size and configuration as to conceal such parts of the inclosed mechanism as may be desired. It

may also have stifi'enin flanges 16 along its upper edge, which over ang portions 0 the skeleton frame member 13; and numerous vertical stiffening ribs 16* may be cast on the inner side of the auxiliary base, extending down from the flanges to the bottom of the base wall.

The. auxiliary base may be firmly secured to the skeleton frame, thereby producing a double frame, by appropriate fastening elements, such as screws 17, which may pass through openin s 18 in said inner frame member, into t readed engagement with screw holes 19 tapped in thickened portions 20 projecting from the inner surface of said outer base or member, which thus may present an unbroken outer surface. The surface of the outer or auxiliar base may be polished or otherwise finlshe so as to resent a pleasing and artisticappearance. he thickenings or boots 20 contribute stiffness to the frame 15,- 16, in the same manner as v the ribs 16.

Although the auxiliary or outer base member enhances the appearance of the machine, it is not confined to such use. As herein illustrated, the front cross-bar of the base forms a support for the stop 21, which limits the downward movement of the space bar 22. By thus supporting the stop on the base it becomes unnecessa to increase the weight of the frame 13 by extending the same across the front of the machine.

To apply the auxiliary base to the typewriter, in the form in which the invention is herein disclosed, the platen carriage should first be dismounted. The auxiliary basemay then be lowered over the skeleton inner frame member from above to the position illustrated in Fig. 1, after which the screws 17 ma be passed through the openings 18 in sai inner frame member from the inner side, into engagement with thethreaded openings 19 in the thickened portions 20 of the auxiliary base. The carriage may then be remounted.

tion of a machine of the above-described character, having a structural inner frame member which may be designed wholly from the standpoint of mechanical efliciency and.

utility, and yet, as a result of the combination therewith of the auxiliary base, the finished product, without exceeding the necessarily restricted limit as to size and weight, may be caused to have an artistic and pleasing appearance adapted to appeal to the purchasing public while, owing to its double construction, it possesses the staunch quality that is important in typewriters which are designed for the portable class and must hence combine compactness with lightness and strength. It will be seen that the inner frame member serves as a direct mounting for most of the mechanism, while the outer base member contributes the strength and rigidity of an unbroken or single-piece casting, and that the firm connection of these two members produces additional strength without undue Weight, since the outer member is made of a light metal or alloy, such as aluminum.

Variations may be resorted to within the scope of the invention, and portions of the im rovements may be used without others.

aving thus described my invention, I

claim: a V

1. A typewriter havin a frame member in which parts of the mec anism are mounted by means of appropriate fastening devices, and an auxiliary reinforcing base of relatively light metal secured thereto and having an unbroken outer surface, and having parts overhanging and surrounding portions of said frame member, in which said fastening devices are secured.

2. A typewriter havin a. frame member in whichparts of the mecianism are mounted by means of appropriate fastening devices, an auxiliary reinforcing base of relatively light metal secured thereto and having parts overhanging and surrounding portions of said frame member in which said fastening devices are secured, and means for securing the base to the frame member by fastenin devices engaging the inner surface of sai base, leaving its outer surface unbroken.

3. A typewriter having a skeleton frame member of structural material in which working parts of the mechanism may be secured, and an aluminum auxiliary base having an unbroken outer surface to conceal portions of said skeleton rrame member and parts mounted therein.

4. A typewriter having a skeleton frame member of structural material in which working parts of the mechanism may be secured, an aluminum auxiliary base having an unbroken outer surface to conceal portion of said skeleton frame member and parts mounted therein, and fastening devices connecting said skeleton frame member to the inner surface of said base.

' 5. The combination with a typewriter having a space bar and a frame in which parts of the mechanism including said bar are mounted, of an auxiliary one-piece aluminum base to conceal portions of said frame and parts mounted therein, said frame forming a support for a stop to limit downward movement of said space bar.

6. A portable typewriter having a double frame comprising inner and outer members, the inner member being a general support for typewritin mechanism, and the outer member being rmly secured thereto to form a double frame, said outer member being formed in a single piece of light metal.

7. A portable type writer having a double frame comprising inner and outer members, the inner member being a general support for typewriting mechanism, and the outer member being firmly secured thereto to form a double frame, said outer member being formed in a single ieoe of light metal, and having parts over angin and surroundmg said mner member an serving as a casing to give a finished appearance to the machine.

8. A portable typewriter having a double frame comprising inner and outer members, the inner member being a general support for typewritin mechanism, and the outer member bein rmly secured thereto to form a double ame, said outer member be formed in a single piece of light metal, an A having parts overhanging and surrounding member being firmly secured thereto toform a double frame, said outer member being a single-piece casting of light metal, for example aluminum.

' GEORGE W. CAMPBELL. Witnessesz' M. A. Pmmurs, L. M. DoBsoN. 

